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Mass spectra of mass-selected [d-UBI-a + 8H]10+ ions – denoted by the asterisk – following irradiation at λA = 545 nm (a) and λD = 505 nm (b). The peaks denoted d/d-SH and a/a-SH correspond to breaking of the either side of the sulphur atom in the thioether linker. The red stars represent the acceptor chromophore-specific photofragments. The blue circles denote fragments associated with the donor chromophore
